NUT (P/N an320-4) - New Surplus

The AN320-4 is a castellated shear nut conforming to AN320 specifications for 1/4-28 threads. This steel nut features radial slots that accept a cotter pin for positive mechanical locking, preventing loosening under vibration. Designed for use with drilled-shank and clevis bolts in shear-loaded structural joints throughout aircraft assemblies.

Installation requires inserting a cotter pin through the nut slots and the bolt's drilled hole, then bending the pin ends to lock. Standard practice in general and commercial aviation maintenance.

What is the NUT (P/N an320-4)?

The AN320-4 is a castellated shear nut conforming to AN320 specifications for 1/4-28 threads. This steel nut features radial slots that accept a cotter pin for positive mechanical locking, preventing loosening under vibration.

What conditions is the an320-4 available in?

The an320-4 is currently available in the following conditions: New Surplus. Each condition reflects the part's maintenance history and certification status per FAA standards.

How do I get pricing for the an320-4?

The an320-4 requires a custom quote. Submit a Request for Quote (RFQ) through our website or call our sales team at (904) 998-9101 for immediate pricing assistance.

Do you offer expedited shipping for the an320-4?

Yes, we offer same-day processing on in-stock items and provide 24/7 AOG (Aircraft on Ground) support for urgent needs. Standard, expedited, and overnight shipping options are available.